Volume Converter

Use this free volume converter to change a volume between milliliters, liters, cubic centimeters, cubic meters, US gallons, quarts, pints, cups, fluid ounces, tablespoons and teaspoons, UK (imperial) gallons, quarts, pints and fluid ounces, and cubic inches, feet and yards. Type a number in either box and the other one follows as you type, with the same volume in the main units shown underneath. US and UK measures are kept apart, because a UK gallon, pint and quart are about 20% bigger than the US ones. Pick how many decimals to round to, swap the two units with one click, and copy a link to your conversion. Charts list the most searched values for gallons to liters, fluid ounces to ml, cups to ml, tablespoons to cups and teaspoons to ml, plus a table of how many cups, ounces, tablespoons and teaspoons are in a gallon. It is free and instant, and your numbers stay in your browser.

How to convert gallons to liters

Multiply the US gallons by 3.785411784. A US gallon is defined as exactly 231 cubic inches, which is 3.785411784 liters, so the answer is exact.

For 1 gallon: 3.785412 L. For 5 gallons: 18.927059 L. For 20 gallons: 75.708236 L.

How to convert liters to gallons

Divide the liters by 3.785411784, which is the same as multiplying by 0.264172. For 1 liter: 0.264172 US gallons. For 10 liters: 2.641721 US gallons. A quick estimate is to divide the liters by almost 4.

Fluid ounces and milliliters

A US fluid ounce is 29.5735296 ml. To change fluid ounces to ml, multiply by 29.5735: 8 fl oz is 236.588 ml. To change ml to fluid ounces, divide by 29.5735: 750 ml is 25.3605 fl oz. In recipes and on drink bottles, "oz" almost always means a fluid ounce, which measures volume. An ounce of weight is a different unit: see the Weight Converter.

Cups, tablespoons and teaspoons

In the US, 1 cup is 8 fluid ounces, 16 tablespoons and 48 teaspoons, and a tablespoon is 3 teaspoons. A US cup is 236.588 ml, a tablespoon is 14.7868 ml and a teaspoon is 4.92892 ml. Many recipes and nutrition labels round a cup to 240 ml, and metric cups are often 250 ml, so check which one your recipe uses.

Pints, quarts and gallons

A US gallon is 4 quarts, 8 pints, 16 cups or 128 fluid ounces. A quart is 2 pints, 4 cups or 32 fluid ounces, and a pint is 2 cups or 16 fluid ounces. The "How Many Cups in a Gallon?" table above lists them all side by side.

US and UK (imperial) measures

The UK gallon is exactly 4.54609 liters, about 20% bigger than the US gallon, and it has 160 fluid ounces, not 128. A UK pint is 568.261 ml and a US pint is 473.176 ml. A UK fluid ounce (28.4131 ml) is a little smaller than a US one (29.5735 ml). 1 UK gallon is 1.20095 US gallons. The lists keep the two apart, so choose the one you mean.

Cubic meters, cubic feet and liters

A cubic meter is 1,000 liters, 264.172 US gallons or 35.3147 cubic feet. A cubic foot is 28.3168 liters and 7.480519 US gallons, so 1 US gallon is 0.133681 cubic feet. A cubic inch is 16.387064 ml, and a cubic yard is 27 cubic feet, or 764.555 liters.

Milliliters and cubic centimeters (cc)

One milliliter is exactly one cubic centimeter, and a liter is 1,000 cm³. So 5 cc is 5 ml, which is about one US teaspoon (4.93 ml).

Liquid and dry measures

This converter uses US liquid measures. US dry measures use the same names but are bigger: a US dry pint is about 550.61 ml, against 473.18 ml for a liquid pint. UK measures are the same for liquids and dry goods.

Why a US gallon is exactly 3.785411784 liters

The US gallon is defined as exactly 231 cubic inches, and the inch is defined as exactly 25.4 mm. Because of that, every conversion between US measures, the metric units and cubic inches or feet is exact, and the converter shows as many digits as you ask for.

This converter is for everyday use. Do not use it to measure a medicine dose: ask a doctor or a pharmacist.